Is there really a debris disc around ζ 2 Reticuli?

V. Faramaz, G. Bryden, K. R. Stapelfeldt, M. Booth, A. Bayo, H. Beust, S. Casassus, J. Cuadra, A. Hales, A. M. Hughes, J. Olofsson, K. Y.L. Su, D. J. Wilner

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The presence of a debris disc around the Gyr-old solar-type star ζ 2 Reticuli was suggested by the Spitzer infrared excess detection. Follow-up observations with Herschel/PACS revealed a double-lobed feature that displayed asymmetries both in brightness and position. Therefore, the disc was thought to be edge-on and significantly eccentric. Here we present ALMA/ACA observations in Band 6 and 7 which unambiguously reveal that these lobes show no common proper motion with ζ 2 Reticuli . In these observations, no flux has been detected around ζ 2 Reticuli that exceeds the 3σ levels. We conclude that surface brightness upper limits of a debris disc around v Reticuli are 5.7 μJy arcsec-2 at 1.3 mm, anζ 26 μJy arcsec-2 at 870 microns. Our results overall demonstrate the capability of the ALMA/ACA to follow-up Herschel observations of debris discs and clarify the effects of background confusion.

Original languageEnglish (US)
Pages (from-to)44-48
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Volume481
Issue number1
DOIs
StatePublished - Nov 21 2018
Externally publishedYes

Keywords

  • Circumstellar matter
  • Stars: individual: ζ Reticuli

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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